Seattle — Very slow in warming to the occasion, Stanford waited until the second half to find its game. When it did, though, it ran away and hid from Colorado.

The No. 4-ranked and top-seeded Cardinal trounced the ninth-seeded Buffaloes 69-54 Friday in the quarterfinals of the Pac-12 Tournament at KeyArena.

Chiney Ogwumike scored 14 of her 19 points in the second half. Stanford (29-2) also had 15 points each from Bonnie Samuelson and Lili Thompson. Mikaela Ruef grabbed 16 rebounds to go with 10 points and five assists.

Trailing 28-24 early in the second half, the Cardinal went on a 17-2 run to take a 41-30 lead. For a change it wasn’t Ogwumike who led it. Thompson scored eight of her team’s points in a row, the last on a three-point play that she converted after hitting an off-balance jumper from the baseline.

While the Buffs (17-14) piled up fouls at one end, they couldn’t sink many shots at the other. Brittany Wilson scored 16 points to lead them, but just five in the second half. Arielle Roberson had 15 rebounds for CU.

In the first half, the Cardinal struggled mightily. Maybe it was the noon tipoff. More likely it was the Buffs’ tough defense. In any case, the Cardinal made just 1 of 10 three pointers in the first half and shot just 24 percent from the field (7-for-29), trailing 23-21 at the break.

Ogwumike had just five points and six rebounds in the first half. Colorado all but shut off the entry pass to her. Meanwhile, Samuelson – usually a deadeye – missed all four of her long-range shots. Brittany Wilson, on the other hand, was 3-for-6 on threes for 11 points.

The Buffs weren’t shooting well either, just 28 percent, and they committed 13 fouls, nearly twice as many as the Cardinal. But CU enjoyed a 25-20 rebounding advantage in the first half.